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Wind and Structures
  Volume 27, Number 6, December 2018 , pages 439-449

Shielding effects on a tall building from a row of low and medium rise buildings
G.B. Zu and K.M. Lam

    Wind loading of a tall building built amidst a group of buildings in urban environment is always greatly affected by shielding effects. Wind tunnel tests were carried out to assess the shielding provided by a row of low-rise or medium-rise buildings upstream a square-section tall building of height-to-breadth ratio 6. Mean and dynamic wind loads on the tall building were measured at different wind incidence angles and presented as interference factors (IFs). It is found that presence of a row of upstream buildings provides significant shielding to the tall building. At normal wind incidence, the mean along-wind loads and all components of fluctuating wind loads on the tall building are always reduced by shielding. Vortex shedding seems to still occur on the upper exposed part of the tall building but the vortex excitation levels are largely reduced. The degree of shielding is found to depend on a number of arrangement parameters of the row of upstream buildings. Empirical equations are proposed to quantify the shielding effect based on the wind tunnel data.
Key Words
    tall buildings; shielding effect; interference; wind loads
G.B. Zu: Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong
2Grandland Group, No.2098, Shennan East Road, Shenzhen, Guangdong, China
K.M. Lam: Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong


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